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Method and apparatus for preparing sludge gas with biomass anaerobic fermentation

An anaerobic fermentation and biomass technology, applied in the direction of microorganism-based methods, biochemical equipment and methods, fermentation, etc., can solve the problems of easy pollution, low conversion rate, high cost, etc., to ensure efficient operation, improve conversion rate, The effect of high-efficiency fermentation and

Active Publication Date: 2011-11-02
江苏乐尔环境科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, it is often costly to make a product with high purity, which is difficult to be practical.
As fuel is directly burned, it is easy to pollute on a small scale, and it is difficult to use it efficiently due to low energy density on a large scale.
Farmers in rural areas directly carry out anaerobic fermentation to produce biogas. Although it is simple and feasible, it is difficult to realize large-scale treatment and utilization due to slow speed and low conversion rate.
However, in order to realize large-scale anaerobic fermentation to produce biogas, it is necessary to solve the problems of low conversion rate, slow speed and the treatment of waste liquid.

Method used

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  • Method and apparatus for preparing sludge gas with biomass anaerobic fermentation
  • Method and apparatus for preparing sludge gas with biomass anaerobic fermentation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] As shown in Figure 1, the biomass 1 (in this example, corn stalks) crushed to 3 mm is sent into the hydrothermal reaction tank 2 (by weight content of biomass 20% to 25%) of physical and chemical treatment, and the addition amount is Sulfuric acid is added at a weight ratio of 2%, and hydrothermal reaction is carried out at 90°C. After the straw is decomposed into biodegradable substances, it is sent to the biohydrolysis tank 3, and after being hydrolyzed at 37°C, it is sent to the biological acid fermentation tank 4. At 37°C, the material is decomposed into organic acids mainly composed of acetic acid, and then sent to the methane fermenter 5 to convert the organic acids into methane at 37°C. The material after methane fermentation is discharged into the ultrasonic processor 6 at 0.15W / cm 2 , after 3min action, send into vibrating separator 7, thalline 8 is returned in the methane fermentation tank 5 after vibrating separation, and the about 70% slag material 9 dischar...

Embodiment 2

[0027] The mixture of wheat straw and wood sawdust crushed to 2 mm (by weight, wheat straw:wood sawdust is 6:10) is sent to a hydrothermal reaction tank, and enters a biological reaction system after hydrothermal reaction. The reaction system is as shown in Figure 1, and the reaction conditions are as in Example 1, except that no ultrasonic processor is provided and the biohydrolysis and acid fermentation are carried out in the same tank. The weight content of biomass in biological reaction systems such as acid fermenter and methane fermenter is between 30% and 35%. The conversion rate reaches more than 75%.

Embodiment 3

[0029] The rice straw broken to 3mm and the cassava stalk of 1mm (by weight, rice straw: cassava stalk is 6.5: 10) are sent into the hydrothermal reaction tank for hydrolysis (138 ℃, ammonia water content 2% in the hydrothermal reaction material) and then sent Into the system shown in Figure 1 for biological treatment to obtain biogas. The difference is that after hydrolysis at 45°C, it is sent to the biological acid fermentation tank 4, and the material is decomposed into organic acids mainly composed of acetic acid at 45°C, and then sent to the methane fermentation tank 5 to decompose the organic acid at 45°C. converted to methane. The discharged material is directly used as fertilizer without aerobic treatment by air aeration. In biological hydrolysis tanks, acid fermenters, and methane fermenters, the biomass weight content is 45%-50%, and the ultrasonic wave is at 3W / cm 2 Down, the role of 0.2min. The conversion rate reaches more than 78%.

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Abstract

The invention relates to a method for manufacturing methane with biomass by carrying out anaerobic fermentation and a device thereof. The method comprises the following steps: 1) a hydro-thermal reaction process is adopted to resolve biologically recalcitrant biomass materials into biologically labile substances; 2) biological hydrolysis is carried out on biologically labile substances to obtain a hydrolysate; 3) the hydrolysate is transformed into organic acid by acid fermentation of microorganism; 4) the organic acid is transformed into methane gas by the microorganism; 5) the left materials in step 4 are returned to step 2 for carrying out the biological hydrolysis. In the invention, high efficient fermentation and multipurpose use without waste liquor are realized by the processes of biological hydrolysis of reflux circulating slurry reactor type biomass, the acid fermentation and methane fermentation; methane bacteria is obtained by ultrasonication and oscillating separation and is utilized circularly by reflux, ensuring highly effective operation of the system; in addition, the hydro-thermal reaction and the follow-up biological response system improve conversion rate of thebiomass.

Description

technical field [0001] The invention relates to a method and equipment for producing biogas from biomass through anaerobic fermentation, and belongs to the technology in the field of solid waste treatment and resource utilization and the field of new energy. Especially the method for producing biogas by anaerobic fermentation of plant stalks. Background technique [0002] A large amount of straw is produced in the process of agricultural production, and a large amount of biomass waste such as sawdust, bark and scraps are produced in the process of tree product production, especially agricultural straw is often burned on site as waste to pollute the environment. On the other hand, biomass contains a large amount of organic matter and is a rich resource. There have been many explorations on the resource utilization of biomass. Wherein, it is often costly to make a product with high purity, which is difficult to be practical. As fuel is directly burned, it is easy to pollute ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02C12M1/107C12R1/00
CPCY02E50/343Y02E50/30
Inventor 张书廷
Owner 江苏乐尔环境科技股份有限公司